Here is the full list of all 11 Snotty's Sewer achievements.
Die to Mr Snotty and his friends
Press 10 buttons in the sewer
Survived to tell the tale
Press 50 buttons in the sewer
Press 100 buttons in the sewer
Die to Mr Snotty and his friends 10 times
Survived to tell the tale 10 times
Survived to tell the tale 25 times
Survived to tell the tale 50 times
Survived to tell the tale 100 times
Look at all the amazing developers that made the game!